Display apparatus

Abstract

A display apparatus includes a backlight unit which generates first light including first blue light, first green light and first red light and a display panel which receives the first light to display an image, where the backlight unit includes: a light emitting diode which generates an ultraviolet ray; a fluorescent substance layer disposed on the light emitting diode, where the fluorescent substance layer includes: a blue fluorescent substance layer which receives the ultraviolet ray and emits blue light; a green fluorescent substance layer which receives the ultraviolet ray and emits green light; and a red fluorescent substance layer which receives the ultraviolet ray and emits red light; and a first band-pass filter which receives the blue light, the green light and the red light and outputs the first blue light, the first green light and the first red light.

What is claimed is: 
     
       1. A display apparatus comprising:
 a backlight unit which generates first light and second light including first and second blue light, first and second green light and first and second red light, respectively; and 
 a display panel which receives the first and second light to display an image, 
 wherein the backlight unit comprises: 
 a light emitting diode which generates an ultraviolet ray; 
 a fluorescent substance layer disposed on the light emitting diode, wherein the fluorescent substance layer comprises: 
 a blue fluorescent substance layer which receives the ultraviolet ray and emits blue light; 
 a green fluorescent substance layer which receives the ultraviolet ray and emits green light; and 
 a red fluorescent substance layer which receives the ultraviolet ray and emits red light; and 
 first and second band-pass filters which receive the blue light, the green light and the red light and output the first and second blue light, the first and second green light and the first and second red light, respectively. 
 
     
     
       2. The display apparatus of  claim 1 , wherein
 the display panel receives the first light and the second light to display a three-dimensional image. 
 
     
     
       3. The display apparatus of  claim 2 , wherein
 the first blue light has a peak wavelength different from a peak wavelength of the second blue light, 
 the first green light has a peak wavelength different from a peak wavelength of the second green light, and 
 the first red light has a peak wavelength different from a peak wavelength of the second red light. 
 
     
     
       4. The display apparatus of  claim 3 , wherein
 the peak wavelength of the first blue light is separated from the peak wavelength of the second blue light at least by a full width at half maximum of the first blue light or the second blue light, 
 the peak wavelength of the first green light is separated from the peak wavelength of the second green light at least by a full width at half maximum of the first green light or the second green light, and 
 the peak wavelength of the first red light is separated from the peak wavelength of the second red light at least by a full width at half maximum of the first red light or the second red light. 
 
     
     
       5. The display apparatus of  claim 3 , wherein the ultraviolet ray emitted from the light emitting diode has a wavelength from about 350 nanometers to about 400 nanometers. 
     
     
       6. The display apparatus of  claim 5 , wherein
 each of the first and second blue lights has a wavelength in a range from about 425 nanometers to about 475 nanometers, 
 each of the first and second green lights has a wavelength in a range from about 500 nanometers to about 550 nanometers, and 
 each of the first and second red lights has a wavelength in a range from about 600 nanometers to about 650 nanometers. 
 
     
     
       7. The display apparatus of  claim 3 , wherein
 the first band-pass filter comprises: 
 a first pass-band through which the first blue light transmits; 
 a second pass-band through which the first green light transmits; and 
 a third pass-band through which the first red light transmits, and 
 the second band-pass filter comprises: 
 a fourth pass-band through which the second blue light transmits; 
 a fifth pass-band through which the second green light transmits; and 
 a sixth pass-band through which the second red light transmits. 
 
     
     
       8. The display apparatus of  claim 7 , wherein the first to sixth pass-bands are not overlapping each other. 
     
     
       9. The display apparatus of  claim 3 , wherein
 the backlight unit further comprises a housing which accommodates the light emitting diode and the fluorescent substance layer, 
 the light emitting diode, the fluorescent layer and the housing collectively define a light emitting diode package, and 
 the backlight unit comprises a plurality of light emitting diode package. 
 
     
     
       10. The display apparatus of  claim 9 , wherein
 each of the blue, green and red fluorescent substances comprises at least one of an oxide-based compound, a sulphur-based compound and a nitride-based compound. 
 
     
     
       11. The display apparatus of  claim 10 , wherein
 the blue fluorescent substance comprises at least one of BaMg 2 Al 16 :Eu 2+ ; Sr 4 Al 14 O 25 :Eu 2+ ; BaAl 18 O 13 :Eu 2+ ; (Sr,Mg,Ca,Ba) 5 (PO 4 ) 3 Cl:Eu 2+ ; and Sr 2 Si 3 O 8 .2SrCl 2 :Eu 2+ , 
 the green fluorescent substance comprises at least one of (Sr,Ba,Ca,Mg) 2 SiO 4 :Eu 2+ ; the oxide-based compound of (Sr,Ba,Ca,Mg) 3 SiO 5 :Eu 2+  including M 3 SiO 5 ; the sulphur-based compound including SrGa 2 S 4 ;Eu; the nitride-based compound including β-SiAlON; a nitride or oxynitride crystal employing Eu among crystals having a β-type Si 3 N 4  crystal structure; Ba 2 MgSi 2 O 7 :Eu 2+ ; Ba 2 ZnSi 2 O 7 :Eu 2+ ; BaAl 2 O 4 :Eu 2+ ; SrAl 2 O 4 :Eu 2+ ; BaMgAl 10 O 17 :(Eu 2+ ,Mn 2+ ); and BaMg 2 Al 16 O 27 :(Eu 2+ ,Mn 2+ ), and 
 the red fluorescent substance comprises at least one of Y 2 O 3 :(Eu 3+ ,Bi 3+ ); (Sr,Ca,Ba,Mg,Zn) 2 P 2 O 7 :(Eu 2+ ,Mn 2+ ); (Ca,Sr,Ba,Mg,Zn) 10 (PO 4 ) 6 (F,Cl,Br,OH) 2 :(Eu 2+ ,Mn 2+ ); (Gd,Y,Lu,La) 2 O 3 :(Eu 3+ ,Bi 3+ ); (Gd,Y,Lu,La)BO 3 :(Eu 3+ ,Bi 3+ ); (Gd,Y,Lu,La)(P,V)O 4 :(Eu 3 +,Bi 3+ ); (Ba,Sr,Ca)MgP 2 O 7 :(Eu 2+ ,Mn 2+ ); (Y,Lu) 2 WO 6 :(Eu 3+ ,Mo 6+ ); (Sr,Ca,Ba,Mg,Zn) 2 SiO 4 :(Eu 2+ ,Mn 2+ ); the sulphur-based compound of (Ca,Sr)S:Eu 2+ ;(Gd,Y,Lu,La) 2 O 2 S:(Eu 3+ ,Bi 3+ ); CaLa 2 S 4 :Ce 3+ ; the nitride-based compound of (Sr,Ca)AlSiN 3 :Eu 2+ ; (Ba,Sr,Ca) 2 Si 5 N 8 :Eu 2+ ; and (Ba,Sr,Ca) 2SiO4-x N y :Eu 2+ . 
 
     
     
       12. The display apparatus of  claim 9 , wherein
 the first band-pass filter is disposed on a light emitting surface of a first part of the light emitting diode packages, and 
 the second band-pass filter is disposed on a light emitting surface of a second part of the light emitting diode packages, which is different from the first part of the light emitting diode packages. 
 
     
     
       13. The display apparatus of  claim 12 , wherein
 the backlight unit further comprises a printed circuit board electrically connected to the light emitting diode packages to provide a driving voltage and disposed vertical to a light emitting surface of the light emitting diode. 
 
     
     
       14. The display apparatus of  claim 13 , wherein
 the backlight unit further comprises a first frame disposed on the printed circuit board, covering at least one side surface of the light emitting diode packages, and including a plurality of receiving holes which accommodates the first band-pass filter and the second band-pass filter. 
 
     
     
       15. The display apparatus of  claim 14 , wherein
 the backlight unit further comprises a second frame which covers the first frame, the first and second band-pass filters and the light emitting diode packages. 
 
     
     
       16. The display apparatus of  claim 9 , wherein
 the backlight unit further comprises a light guide plate disposed adjacent to the light emitting diode packages and which guides the first and second lights to the display panel from the light emitting diode packages. 
 
     
     
       17. The display apparatus of  claim 3 , wherein
 the light emitting diode comprises: 
 a first light emitting diode corresponding to the first band-pass filter; and 
 a second light emitting diode corresponding to the second band-pass filter, and 
 the fluorescent substance layer comprises: 
 a first fluorescent substance corresponding to the first band-pass filter; and 
 a second fluorescent substance corresponding to the second band-pass filter. 
 
     
     
       18. The display apparatus of  claim 17 , wherein each of the blue, green and red fluorescent substances comprises at least one of an oxide-based compound, a sulphur-based compound and a nitride-based compound. 
     
     
       19. The display apparatus of  claim 18 , wherein
 the blue fluorescent substance comprises at least one of BaMg 2 Al 16 :Eu 2+ ; Sr 4 Al 14 O 25 :Eu 2+ ; BaAl 18 O 13 :Eu 2+ ; (Sr,Mg,Ca,Ba) 5 (PO 4 ) 3 Cl:Eu 2+ ; and Sr 2 Si 3 O 8 .2SrCl 2 :Eu 2+ , 
 the green fluorescent substance comprises at least one of (Sr,Ba,Ca,Mg) 2 SiO 4 :Eu 2+ ; the oxide-based compound of (Sr,Ba,Ca,Mg) 3 SiO 5 :Eu 2+  including M 3 SiO 5 ; the sulphur-based compound including SrGa 2 S 4 ;Eu; the nitride-based compound including β-SiAlON; a nitride or oxynitride crystal employing Eu among crystals having a β-type Si 3 N 4  crystal structure; Ba 2 MgSi 2 O 7 :Eu 2+ ; Ba 2 ZnSi 2 O 7 :Eu 2+ ; BaAl 2 O 4 :Eu 2+ ; SrAl 2 O 4 :Eu 2+ ; BaMgAl 10 O 17 :(Eu 2+ ,Mn 2+ ); and BaMg 2 Al 16 O 27 :(Eu 2+ , Mn 2+ ), and 
 the red fluorescent substance comprises at least one of Y 2 O 3 :(Eu 3+ ,Bi 3+ ); (Sr,Ca,Ba,Mg,Zn) 2 P 2 O 7 :(Eu 2+ ,Mn 2+ ); (Ca,Sr,Ba,Mg,Zn) 10 (PO 4 ) 6 (F,Cl,Br,OH) 2 :(Eu 2+ ,Mn 2+ ); (Gd,Y,Lu,La) 2 O 3 :(Eu 3+ ,Bi 3+ ); (Gd,Y,Lu,La)BO 3 :(Eu 3+ ,Bi 3+ ); (Gd,Y,Lu,La)(P,V)O 4 :(Eu 3 +,Bi 3+ ); (Ba,Sr,Ca)MgP 2 O 7 :(Eu 2+ ,Mn 2+ ); (Y,Lu) 2 WO 6 :(Eu 3+ ,Mo 6+ ); (Sr,Ca,Ba,Mg,Zn) 2 SiO 4 :(Eu 2+ ,Mn 2+ ); the sulphur-based compound of (Ca,Sr)S:Eu 2+ ; (Gd,Y,Lu,La) 2 O 2 S:(Eu 3+ ,Bi 3+ ); CaLa 2 S 4 :Ce 3+ ; the nitride-based compound of (Sr,Ca)AlSiN 3 :Eu 2+ ; (Ba,Sr,Ca) 2 Si 5 N 8 :Eu 2+ ; and (Ba,Sr,Ca) 2 SiO 4-x N y :Eu 2+ . 
 
     
     
       20. The display apparatus of  claim 17 , wherein the first light emitting diode and the second light emitting diode have substantially the same configuration. 
     
     
       21. The display apparatus of  claim 17 , wherein
 the backlight unit further comprises a first housing which accommodates the first light emitting diode, the first fluorescent substance layer and the first band-pass filter, and 
 a second housing which accommodates the second light emitting diode, the second fluorescent substance layer and the second band-pass filter. 
 
     
     
       22. The display apparatus of  claim 21 , wherein
 the first fluorescent substance layer is disposed facing the first light emitting diode, and an air layer is interposed therebetween, and 
 the second fluorescent substance layer is disposed facing the second light emitting diode, and an air layer is interposed therebetween. 
 
     
     
       23. The display apparatus of  claim 22 , wherein
 the first fluorescent substance layer is in contact with the first band-pass filter, and 
 the second fluorescent substance layer is in contact with the second band-pass filter. 
 
     
     
       24. The display apparatus of  claim 21 , wherein
 the first fluorescent substance layer is in contact with the first light emitting diode, and 
 the second fluorescent substance layer is in contact with the second light emitting diode. 
 
     
     
       25. The display apparatus of  claim 2 , further comprising a glasses comprising:
 a first filter glass having a pass-band substantially identical to a pass-band of the first band-pass filter; and 
 a second filter glass having a pass-band substantially identical to a pass-band of the second band-pass filter.